<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header :addTodo="addTodo"></Header>
      <List
        :todoList="todoList"
        :updateDone="updateDone"
        :deleteOne="deleteOne"
      />
      <Footer :todoList="todoList"
      :changeAllDone="changeAllDone"
      :removeAllDone="removeAllDone"></Footer>
    </div>
  </div>
</template>

<script>
import Header from "@/components/Header";
import Footer from "@/components/Footer";
import List from "@/components/List";
export default {
  name: "App",

  // 组件
  components: {
    Header,
    Footer,
    List,
  },
  data() {
    return {
      todoList: [
        // { id: "001", done: false, content: "敲代码" },
        // { id: "002", done: false, content: "来敲代码" },
        // { id: "003", done: false, content: "快来代码" },
      ],
    };
  },

mounted() {
  this.todoList=JSON.parse(localStorage.getItem("todoList")||"[]")
},
  // methods将被混入到Vue实例中。可以直接通过VM实例访问这些方法，或者在指令表达式中使用。方法中的this自动绑定为Vue实例
  methods: {
    // 表单添加todo的方法
    addTodo(newTodo) {
      // 在首部添加
      this.todoList.unshift(newTodo);
    },

    // 修改单个done的方法
    updateDone(id) {
      this.todoList.forEach((item) => {
        if (item.id === id) {
          item.done = !item.done;
        }
      });
    },

    // 删除单个的方法
    deleteOne(id) {
      this.todoList = this.todoList.filter((item) => {
        return item.id !== id;
      });
    },


  // 改变全选
  changeAllDone(newVal) {
    this.todoList = this.todoList.map((item) => {
      item.done = newVal;
      return item;
    });
  },

  // 删除所有已完成
  removeAllDone() {
    this.todoList = this.todoList.filter((item) => {
      return !item.done;
    });
  },
},

watch: {
  todoList: {
    deep:true,
    handler(){
      localStorage.setItem("todoList",JSON.stringify(this.todoList))
    }
  }
}
}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
